BooleanPreference has a value of true. If the "Do not show again" checkbox is selected when the dialog is dismissed the value of the preference is changed to false, meaning that this message will not be shown in the future. This is a synchronous call - if the message is displayed the calling thread blocks until the message dialog has been dismissed.
@param owner an optional Component representing the owner of the message dialog. If null the currently active frame will be used as owner.
@return true if the dialog was displayed
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